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Diagnostic Trouble Code Chart

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

AIR CONDITIONING SYSTEM 

DIAGNOSTIC TROUBLE CODE CHART

DTC No. Detection Item Trouble Area Memory(4)
B1411/11(1) Room Temperature Sensor Circuit
  1. Room temperature sensor
  2. Harness and connector between room temperature sensor and A/C amplifier
  3. A/C amplifier
 Memorized (8.5 min. or more)
B1412/12(2) Ambient Temperature Sensor Circuit
  1. Ambient temperature sensor
  2. Harness and connector between ambient temperature sensor and ECM
  3. ECM
  4. Multiplex communication circuit
  5. A/C amplifier
 Memorized (8.5 min. or more)
B1413/13 Evaporator Temperature Sensor Circuit
  1. Air conditioning harness (evaporator temperature sensor)
  2. A/C amplifier
 Memorized (8.5 min. or more)
B1418/18 Exhaust Gas Sensor Circuit
  1. Smog ventilation sensor (emission gas sensor)
  2. Harness and connector between smog ventilation sensor (emission gas sensor) and A/C amplifier
  3. A/C amplifier
 -
B1421/21(3) Solar Sensor Circuit (Passenger Side)
  1. Solar sensor
  2. Harness and connector between solar sensor and A/C amplifier
  3. Harness and connector between solar sensor and multiplex network body ECU (cowl side junction block ECU RH)
  4. A/C amplifier
 Memorized (8.5 min. or more) (only when circuit is shorted)
B1422/22 Compressor Lock Sensor Circuit
  1. A/C compressor
  2. A/C compressor drive belt
  3. A/C compressor and magnetic clutch lock sensor
  4. Harness and connector between ECM and A/C compressor
  5. ECM
  6. A/C amplifier
 -
B1423/23 Pressure Switch Circuit
  1. Pressure sensor
  2. Harness and connector between pressure sensor and A/C amplifier
  3. Refrigerant pipe line
  4. A/C amplifier
 -
B1424/24(3) Solar Sensor Circuit (Driver Side)
  1. Solar sensor
  2. Harness and connector between solar sensor and A/C amplifier
  3. Harness and connector between solar sensor and multiplex network ECU (cowl side junction block ECU RH)
  4. A/C amplifier
 Memorized (8.5 min. or more) (only when circuit is shorted)
B1451/51 Compressor Solenoid Circuit
  1. A/C compressor
  2. Harness and connector between A/C amplifier and solenoid of externally changeable compressor
  3. A/C amplifier
 -
B1461/61 Emission Gas NOx Sensor Circuit
  1. Smog ventilation sensor (emission gas NOx sensor)
  2. Harness and connector between smog ventilation sensor (emission gas NOx sensor) and A/C amplifier
  3. A/C amplifier
 -
B1497/97 BUS IC Communication Malfunction
  1. Air conditioning harness
  2. A/C amplifier
 Memorized (10 sec. or more)
B1499/99 Multiplex Communication Circuit Multiplex communication system Memorized
B1441/41 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
  1. A/C amplifier
  2. Air conditioning harness
  3. Air mix control servo motor
 Memorized (30 sec.)
B1442/42 Air Inlet Damper Control Servo Motor Circuit
  1. A/C amplifier
  2. Air conditioning harness
  3. Air inlet control servo motor
 Memorized (30 sec.)
B1443/43 Air Outlet Damper Control Servo Motor Circuit
  1. A/C amplifier
  2. Air conditioning harness
  3. Air outlet control servo motor
 Memorized (30 sec.)
B1445/45 Front Passenger Seat Side Cool Air Bypass Damper Control Servo Motor Circuit
  1. A/C amplifier
  2. Air conditioning harness
  3. Cool air by-pass damper control servo motor
 Memorized (30 sec.)
B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side)
  1. A/C amplifier
  2. Air conditioning harness
  3. Air mix control servo motor
 Memorized (30 sec.)
(1) If the room temperature is approx. -18.6°C (-1.48°F) or lower, DTC B1411/11 may be output even though the system is normal.
(2) If the ambient temperature is approx. -52.9°C (-63.22°F) or lower, DTC B1412/12 may be output even though the system is normal.
(3) If the check is performed in a dark place, DTC B1421/21 or B1424/24 (solar sensor circuit abnormal) may be output.
(4) The A/C amplifier memorizes the DTC of the respective malfunction if it has occurred for the period of time indicated in the brackets.
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